"This dropped unnecessary change detection passes by over 85%, reducing CPU utilization on lower-end devices from 90% down to a stable 12%."
Queues inner observables and runs them sequentially. This is useful when the execution order matters.
Discuss how OnPush change detection works by checking only when input references change or observables fire.
Live coding interviews often feature RxJS challenges. Memorizing these three operator distinctions will save your live coding score: Behavior on New Emission Best Use Case Cancels the previous inner observable. Search typeaheads (drops old pending HTTP requests). mergeMap Runs all inner observables concurrently. Deleting multiple items where order does not matter. concatMap Queues inner observables and runs them sequentially. Database saves where sequential order is critical. 🔒 Security and Route Guarding decoded frontend angular interview hacking
Components are the building blocks, but emphasize that they are UI-focused, combining TypeScript logic, HTML templates, and CSS encapsulation. Directives: Focus on Structural ( *ngIf* n g cap I f *ngFor* n g cap F o r
Whenever you answer a technical question, follow this formula: Briefly explain the concept.
Traditionally, Angular relies on Zone.js to monkey-patch asynchronous APIs (like setTimeout , promises, and HTTP requests) and trigger change detection automatically. "This dropped unnecessary change detection passes by over
Which is coming up? (e.g., Live Coding, System Design, Conceptual Q&A) Share public link
Cancels the previous inner observable when a new value arrives. Search auto-complete inputs. mergeMap
| Question | Standard Answer | | | :--- | :--- | :--- | | What is a Directive? | "It changes the behavior of Live coding interviews often feature RxJS challenges
Demonstrate knowledge of NgZone.runOutsideAngular() . Show how to run performance-heavy computations outside the Angular context, manually re-entering only when a DOM update is strictly required. OnPush Strategy Mastery
Represents the dynamically instantiated component instance, allowing you to manually bind inputs and subscribe to outputs. 5. Network and Bundle Optimization